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stubtest: check Final variables with literal values against runtime #20858

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Merged
hauntsaninja merged 5 commits into from
Feb 23, 2026
+24 −0
Merged

stubtest: check Final variables with literal values against runtime #20858

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380d5d3
stubtest: check Final variables with literal values against runtime
Vikash-Kumar-23 Feb 22, 2026
2cc6b43
Update mypy/stubtest.py
Vikash-Kumar-23 Feb 22, 2026
b997e14
Refactor: Move Final check to elif branch and clean error string
Vikash-Kumar-23 Feb 22, 2026
8949fd4
Update mypy/stubtest.py
hauntsaninja Feb 22, 2026
8d63f8e
[pre-commit.ci] auto fixes from pre-commit.com hooks
pre-commit-ci[bot] Feb 22, 2026
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8 changes: 8 additions & 0 deletions mypy/stubtest.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1323,6 +1323,14 @@ def verify_var(
stub,
runtime,
)
elif stub.final_value is not None and stub.final_value != runtime:
yield Error(
object_path,
"is inconsistent, stub value for Final var differs from runtime value",
stub,
runtime,
stub_desc=repr(stub.final_value),
)


@verify.register(nodes.OverloadedFuncDef)
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16 changes: 16 additions & 0 deletions mypy/test/teststubtest.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1171,6 +1171,22 @@ def read_write_attr(self, val): self._val = val
""",
error=None,
)
yield Case(
stub="""
from typing import Final
X_FINAL: Final = 2
""",
runtime="X_FINAL = 1",
error="X_FINAL",
)
yield Case(
stub="""
from typing import Final
X_FINAL_OK: Final = 1
""",
runtime="X_FINAL_OK = 1",
error=None,
)

@collect_cases
def test_type_alias(self) -> Iterator[Case]:
Expand Down